A tank contains 60 kg of salt and 1000 L of water. Pure water enters a tank at the rate 8 L/min. The solution is mixed and drains from the tank at the rate 4 L/min. (a) What is the amount of salt in the tank initially? amount = 60 (kg) (b) Let y(t) be the amount of salt (in kilograms) in the tank after t minutes. What differential equation does y satisfy? Use the variable y for y(t). Answer (in kilograms per minute): dy/dt = (c) Find the amount of salt in the tank after t hours. y(t) = 0 (kg)
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